Question about my Singer 15-91
I bought a 15-91 and have been cleaning, oiling and greasing it with Singer lubricant and also restoring the cabinet. I am now sewing on it but noticed that when I wind a bobbin the needle goes up and down. I loosened the stop motion screw first like the manual said, but the needle still goes up and down when winding a bobbin. I also looked in the adjuster's manual but can't find the answer.
Help, please?